Studies on Temporal and Spatial Variations of Phytoplankton in Lake Chaohu

作     者：Dao-Gui Deng Ping Xie Qiong Zhou Hua Yang Long-Gen Guo 

作者机构：Donghu Experimental Station of Lake Ecosystems State Key Laboratory for Freshwater Ecology and Biotechnology of China Institute of Hydrobiology the Chinese Academy of Sciences Wuhan 430072 China 

出 版 物：《Journal of Integrative Plant Biology》 (植物学报（英文版）)

年 卷 期：2007年第49卷第4期

页      面：409-418页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 08[工学] 0815[工学-水利工程] 0901[农学-作物学] 0703[理学-化学] 071004[理学-水生生物学] 0902[农学-园艺学] 

基　　金：Supported by the National Natural Science Foundation of China (30225011) and by a Key Project of the Chinese Academy of Sciences (KSCX2-SW-129).Acknowledgement The authors are grateful to Lake Chaohu Fishery Administration Committee for the fish data 

主　　题：cyanobacterial blooms eutrophication Lake Chaohu phytoplankton zooplankivorous fish. 

摘      要：Temporal and spatial variations of the phytoplankton assemblage in Lake Chaohu, a large shallow eutrophic lake in China, were studied from September 2002 to August 2003. A total of 191 phytoplankton species was identified, among which Chlorophytes （101） ranked the first, followed by Cyanophytes （46） and Bacillariophytes （28）. On aver- age over the entire lake, the maximum total algal biomass appeared in June （19.70 mg/L） with a minimum （5.05 mg/ L） in November. In terms of annual mean biomass, cyanobacteria contributed 45.43% to total algal biomass, followed by Chlorophytes （27.14%）, and Bacillariophytes （20.6%）. When nitrate （NOs-N） and ammonium （NH4-N） concentrations dropped in spring, fixing-nitrogen cyanobacterium （Anabaena） developed quickly and ranked the first in terms of biomass in summer. It is likely that dominance of zooplanktivorous fish and small crustacean zooplankton favored the development of the inedible filamentous or colony forming cyanobacteria. The persistent dominance of cyanobacteria throughout all seasons may indicate a new tendency of the response of phytoplankton to eutrophication in Lake Chaohu.